Fig. 2
From: Age-dependent changes of gender disparities in nasopharyngeal carcinoma survival
Restricted cubic splines with four knots at 35, 45, 55, and 65 were used to flexibly model and visualize the association between cancer-specific mortality risk and age. No significant non-linearity effect was observed for male patients (a), whereas a considerable non-linearity effect was detected in female patients (b). The association between the estimated 5-year cancer-specific survival (CSS) and age in male and female patients were compared (c)